NSK EDD Megatorque Motor - Warning C0: Position Command;Feedback Signal Error; Alarm C3: CPU Error

11. Alarm and Warning
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11.3.9. Warning C0: Position Command/Feedback Signal Error
 This warning occurs when the transient velocity command is excessive in a pulse train command or the
position feedback output signal frequency is abnormal.
 The command TA/HI (Tell alarm history) will identify the cause of the warning.
 In the pulse train input operation, the Driver Unit creates the transient parameter CR (Circular Resolution)
in accordance with inputting pulses. The transient velocity command gets excessively high when the
inputting pulse frequency is higher than the setting of parameter CR (Circular Resolution), which is set
relatively lower to make the Motor one revolution with fewer pulses.
 When the parameter FR (Feedback signal resolution) is specified, the parameter VL (Velocity limiter) is
automatically set. If the actual velocity exceeds the limit, the position feedback signal may not be
outputted correctly.
This alarm occurs when the operating condition does not meet to output the correct position feedback
signal.
 The transient velocity command in the pulse train input is too high.
 Impossible to output the position feedback signal due to excessive motor velocity.
Table 11-16: Cause and remedy for the warning C0
Alarm history
Cause
Remedy
C0 – 0
The transient velocity command exceeds
30 [s
-1
].
 Decrease the frequency of pulse train input.
 Increase the resolution of the parameter CR (Circular Resolution).
C0 –1
The transient velocity command
exceeding 1.5 times of the setting of
parameter VL(Velocity limiter) is inputted
longer than 1 [ms] continuously.
 Decrease the frequency of pulse train input.
 Increase the resolution of the parameter CR (Circular Resolution).
 Decrease the setting of parameter FR (Feedback signal resolution).
C0 – 2
The frequency of position feedback
signal exceeded 2.3 [MHz].
 Decrease the setting of parameter FR (Feedback signal resolution).
 Decrease the Motor velocity.
Decrease the frequency of the pulse generating controller in case of pulse
train command operation. .
 If the velocity exceeds the setting of parameter VL(Velocity limiter)
because of external force, remove the effect of external force.
 Refer to “5. Tuning” if the velocity exceeds the setting of parameter
VL(Velocity limiter) due to poor tuning.
(1) The input ACLR (Alarm clear) or the command CL (Clear alarm) clears the warning.
11.3.10. Alarm C3: CPU Error
 The CPU integrated into the Driver Unit controls carious types of operation.
This alarm reports that the CPU is not properly functioning.
Table 11-17: Cause and remedy for CPU error alarm
Cause
Remedy
(1)
The CPU is not functioning because of
noise.
 Reboot the power
 Take measures against noise.
(2)
Defective Driver Unit
 When it does not recover by the reset of power, the Driver Unit may be
defective. Replace it referring to “Appendix 5: Procedure for Replacing
Driver Unit Model EDD,” if necessary.